Marty plans to make an alien costume for a party. he needs 7/8 yard of fabric and 1 1/2 yards of aluminum foil for the costume. fabric costs $5 per yard. will the fabric needed to make the costume cost more than $5 or less than $5

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b